1952 Zenith Bugeye AM/FM Clock Radio

[vortalexfan]

Hello Everyone, earlier late last year I had found at Goodwill for $5 a 1952 Zenith Bugeye AM/FM Clock Radio that was in really good shape yet and still worked without hum on its original power supply capacitors.

It recently though had one of its power supply capacitors fail, but what's weird is that it only affected part of the radio's function, the alarm/radio mode is the only part that hums, the radio on mode doesn't hum and neither does the sleep mode.

Any ideas as to why it would of failed that way or is it just random?

Some Pictures of the unit in question below.